I think there is a difference between niches. Like landscape or tree work, the internet space for success has limits and confines. But its pretty certain that other entirely new niches can be developed on the internet. For example, say there was no website showing knot animations, and someone made a site for that. Which was done by the way. Grog's Animated Knots. Pretty cool - take a look sometime. That's what I would say is like exploring for a new mine in the internet. Eventually others will go to work that same mine or mines like it. And so there is the difference between SEO limits for existing business niches and those other niches yet to be found. The mines that have been mined and the mines yet to be unearthed.